1224157946520 has 64 divisors (see below), whose sum is σ = 3678997086720. Its totient is φ = 325862274944.

The previous prime is 1224157946497. The next prime is 1224157946537. The reversal of 1224157946520 is 256497514221.

It is a happy number.

It is a super-2 number, since 2×1224157946520² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1224157946520.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8992224 + ... + 9127343.

It is an arithmetic number, because the mean of its divisors is an integer number (57484329480).

Almost surely, 2^{1224157946520} is an apocalyptic number.

1224157946520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1224157946520 is an abundant number, since it is smaller than the sum of its proper divisors (2454839140200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1224157946520 is a wasteful number, since it uses less digits than its factorization.

1224157946520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18120144 (or 18120140 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 48.

It can be divided in two parts, 12241 and 57946520, that added together give a triangular number (57958761 = T₁₀₇₆₆).

The spelling of 1224157946520 in words is "one trillion, two hundred twenty-four billion, one hundred fifty-seven million, nine hundred forty-six thousand, five hundred twenty".